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Docs of construction undef arrays with missing #31091

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Oct 30, 2020
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Docs of construction undef arrays with missing #31091

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Docs of construction undef arrays with missing
bkamins Feb 16, 2019
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change the description
bkamins Feb 17, 2019
f14bacc
Update doc/src/manual/missing.md
bkamins Oct 24, 2020
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Update doc/src/manual/missing.md
bkamins Oct 25, 2020
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8 changes: 8 additions & 0 deletions doc/src/manual/missing.md
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Expand Up @@ -254,6 +254,14 @@ julia> Array{Union{Missing, String}}(missing, 2, 3)
missing missing missing
```

!!! note
Currently for `T` that is bits type (`isbitstype(T)` returns `true`), if `T`
is not a singleton type then `Array{Union{Missing, T}}(undef, dims)` creates
an array filled with `missing` values. Also in this case calling `similar`
to create an unitialized array that has element type of the form
`Union{Missing, T}` creates an array filled with `missing`. If `T` is a
singleton type the value that is used to fill the array is undefined and
could change in the future, so it should not be relied upon.
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An array allowing for `missing` values but which does not contain any such value
can be converted back to an array which does not allow for missing values using
[`convert`](@ref). If the array contains `missing` values, a `MethodError` is thrown
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